Sullivan County sheriff's deputies have arrested three people for robbing a 15 year old boy and his mother while they were fishing. It hapened underneath the Highway 421 Bridge on South Holston Lake. The victim told detectives three men walked down to where he was fishing and began talking to him. When he went to gather his belongings to leave they pulled a knife on him. The men forced him to give them his backpack which had a cell phone, watch, medications and some money. Kareem Tyriq Rose, Jeffrey Allen Berry and Skyler Shaffer have been arrested in the case. (jb)